+/*
+ This file is part of GNUnet.
+ (C) 2009, 2010 Christian Grothoff (and other contributing authors)
+
+ GNUnet is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, or (at your
+ option) any later version.
+
+ GNUnet is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file transport/transport_api_address_lookup.c
+ * @brief given a peer id, get all known addresses from transport service
+ *
+ * This api provides the ability to query the transport service about
+ * the status of connections to a specific peer. Calls back with a
+ * pretty printed string of the address, as formatted by the appropriate
+ * transport plugin, and whether or not the address given is currently
+ * in the 'connected' state (according to the transport service).
+ */
+
#include "platform.h"
#include "gnunet_client_lib.h"
#include "gnunet_arm_service.h"
#include "gnunet_transport_service.h"
#include "transport.h"
-// FIXME: document
-struct AddressLookUpCB
+/**
+ * Context for the address lookup.
+ */
+struct GNUNET_TRANSPORT_PeerIterateContext
{
- GNUNET_TRANSPORT_AddressLookUpCallback cb;
- void *cls;
- struct GNUNET_TIME_Absolute timeout;
+ /**
+ * Function to call with the binary address.
+ */
+ GNUNET_TRANSPORT_PeerIterateCallback cb;
+
+ /**
+ * Closure for cb.
+ */
+ void *cb_cls;
+
+ /**
+ * Connection to the service.
+ */
struct GNUNET_CLIENT_Connection *client;
+
+ /**
+ * Configuration we use.
+ */
+ const struct GNUNET_CONFIGURATION_Handle *cfg;
+
+ /**
+ * When should this operation time out?
+ */
+ struct GNUNET_TIME_Absolute timeout;
+
+ /**
+ * Backoff for reconnect.
+ */
+ struct GNUNET_TIME_Relative backoff;
+
+ /**
+ * Task ID for reconnect.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
+
+ /**
+ * Identity of the peer to monitor.
+ */
+ struct GNUNET_PeerIdentity peer;
+
+ /**
+ * Was this a one-shot request?
+ */
+ int one_shot;
};
-// FIXME: document
+/**
+ * Function called with responses from the service.
+ *
+ * @param cls our 'struct GNUNET_TRANSPORT_PeerAddressLookupContext*'
+ * @param msg NULL on timeout or error, otherwise presumably a
+ * message with the human-readable address
+ */
+static void
+peer_address_response_processor (void *cls,
+ const struct GNUNET_MessageHeader *msg);
+
+
+/**
+ * Send our subscription request to the service.
+ *
+ * @param pal_ctx our context
+ */
+static void
+send_request (struct GNUNET_TRANSPORT_PeerIterateContext *pal_ctx)
+{
+ struct AddressIterateMessage msg;
+
+ msg.header.size = htons (sizeof (struct AddressIterateMessage));
+ msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE);
+ msg.one_shot = htonl (pal_ctx->one_shot);
+ msg.timeout = GNUNET_TIME_absolute_hton (pal_ctx->timeout);
+ msg.peer = pal_ctx->peer;
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CLIENT_transmit_and_get_response (pal_ctx->client,
+ &msg.header,
+ GNUNET_TIME_absolute_get_remaining (pal_ctx->timeout),
+ GNUNET_YES,
+ &peer_address_response_processor,
+ pal_ctx));
+}
+
+/**
+ * Task run to re-establish the connection.
+ *
+ * @param cls our 'struct GNUNET_TRANSPORT_PeerAddressLookupContext*'
+ * @param tc scheduler context, unused
+ */
+static void
+do_connect (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct GNUNET_TRANSPORT_PeerIterateContext *pal_ctx = cls;
+
+ pal_ctx->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
+ pal_ctx->client = GNUNET_CLIENT_connect ("transport", pal_ctx->cfg);
+ GNUNET_assert (NULL != pal_ctx->client);
+ send_request (pal_ctx);
+}
+
+
+/**
+ * Cut the existing connection and reconnect.
+ *
+ * @param pal_ctx our context
+ */
static void
-address_response_processor (void *cls, const struct GNUNET_MessageHeader *msg)
+reconnect (struct GNUNET_TRANSPORT_PeerIterateContext *pal_ctx)
{
- struct AddressLookUpCB *alucb = cls;
- const char *address;
+ GNUNET_assert (GNUNET_NO == pal_ctx->one_shot);
+ GNUNET_CLIENT_disconnect (pal_ctx->client);
+ pal_ctx->client = NULL;
+ pal_ctx->backoff = GNUNET_TIME_relative_max (GNUNET_TIME_UNIT_MILLISECONDS,
+ GNUNET_TIME_relative_min (GNUNET_TIME_relative_multiply (pal_ctx->backoff, 2),
+ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)));
+ pal_ctx->reconnect_task = GNUNET_SCHEDULER_add_delayed (pal_ctx->backoff,
+ &do_connect,
+ pal_ctx);
+}
+
+
+/**
+ * Function called with responses from the service.
+ *
+ * @param cls our 'struct GNUNET_TRANSPORT_PeerAddressLookupContext*'
+ * @param msg NULL on timeout or error, otherwise presumably a
+ * message with the human-readable address
+ */
+static void
+peer_address_response_processor (void *cls,
+ const struct GNUNET_MessageHeader *msg)
+{
+ struct GNUNET_TRANSPORT_PeerIterateContext *pal_ctx = cls;
+ struct AddressIterateResponseMessage *air_msg;
+ struct GNUNET_HELLO_Address *address;
+ const char *addr;
+ const char *transport_name;
uint16_t size;
+ size_t alen;
+ size_t tlen;
if (msg == NULL)
+ {
+ if (pal_ctx->one_shot)
{
- /* timeout */
- alucb->cb (alucb->cls, NULL);
- GNUNET_CLIENT_disconnect (alucb->client. GNUNET_NO);
- GNUNET_free (alucb);
- return;
+ pal_ctx->cb (pal_ctx->cb_cls, NULL, NULL);
+ GNUNET_TRANSPORT_peer_get_active_addresses_cancel (pal_ctx);
+ }
+ else
+ {
+ reconnect (pal_ctx);
}
+ return;
+ }
size = ntohs (msg->size);
+ GNUNET_break (ntohs (msg->type) ==
+ GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE_RESPONSE);
if (size == sizeof (struct GNUNET_MessageHeader))
+ {
+ /* done! */
+ if (pal_ctx->one_shot)
{
- /* last reply */
- address = NULL;
+ pal_ctx->cb (pal_ctx->cb_cls, NULL, NULL);
+ GNUNET_TRANSPORT_peer_get_active_addresses_cancel (pal_ctx);
}
- else
+ else
{
- address = (const char *) &msg[1];
- if (address[size - sizeof (struct GNUNET_MessageHeader) - 1] != '\0')
- {
- /* invalid reply */
- GNUNET_break_op (0);
- alucb->cb (alucb->cls, NULL);
- GNUNET_CLIENT_disconnect (alucb->client, GNUNET_NO);
- GNUNET_free (alucb);
- return;
- }
- else
- {
- /* expect more replies */
- GNUNET_CLIENT_receive (alucb->client, &address_response_processor,
- alucb,
- GNUNET_TIME_absolute_get_remaining
- (alucb->timeout));
- }
+ reconnect (pal_ctx);
}
- alucb->cb (alucb->cls, address);
- if (address == NULL)
+ return;
+ }
+
+ if ((size < sizeof (struct AddressIterateResponseMessage)) ||
+ (ntohs (msg->type) !=
+ GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE_RESPONSE))
+ {
+ GNUNET_break (0);
+ if (pal_ctx->one_shot)
{
- /* done! */
- GNUNET_CLIENT_disconnect (alucb->client, GNUNET_NO);
- GNUNET_free (alucb);
+ pal_ctx->cb (pal_ctx->cb_cls, NULL, NULL);
+ GNUNET_TRANSPORT_peer_get_active_addresses_cancel (pal_ctx);
}
-}
+ else
+ {
+ reconnect (pal_ctx);
+ }
+ return;
+ }
-void
-GNUNET_TRANSPORT_address_lookup (struct GNUNET_SCHEDULER_Handle *sched,
- const struct GNUNET_CONFIGURATION_Handle
- *cfg, const char *address, size_t addressLen,
- const char *nameTrans,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_TRANSPORT_AddressLookUpCallback aluc,
- void *aluc_cls)
-{
- size_t len =
- sizeof (struct AddressLookupMessage) + addressLen + strlen (nameTrans) +
- 1;
- struct AddressLookupMessage *msg;
- struct GNUNET_TIME_Absolute abs_timeout;
- struct AddressLookUpCB *aluCB;
- struct GNUNET_CLIENT_Connection *client;
+ air_msg = (struct AddressIterateResponseMessage *) msg;
+ tlen = ntohl (air_msg->pluginlen);
+ alen = ntohl (air_msg->addrlen);
- if (len >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ if (size != sizeof (struct AddressIterateResponseMessage) + tlen + alen)
+ {
+ GNUNET_break (0);
+ if (pal_ctx->one_shot)
{
- GNUNET_break (0);
- aluc (aluc_cls, NULL);
- return;
+ pal_ctx->cb (pal_ctx->cb_cls, NULL, NULL);
+ GNUNET_TRANSPORT_peer_get_active_addresses_cancel (pal_ctx);
}
- client = GNUNET_CLIENT_connect (sched, "transport", cfg);
- if (client == NULL)
+ else
{
- aluc (aluc_cls, NULL);
+ reconnect (pal_ctx);
+ }
+ return;
+ }
+
+ if (alen == 0 && tlen == 0)
+ {
+ pal_ctx->cb (pal_ctx->cb_cls, &air_msg->peer, NULL);
+ }
+ else
+ {
+ addr = (const char *) &air_msg[1];
+ transport_name = &addr[alen];
+
+ if (transport_name[tlen - 1] != '\0')
+ {
+ GNUNET_break (0);
+ if (pal_ctx->one_shot)
+ {
+ pal_ctx->cb (pal_ctx->cb_cls, NULL, NULL);
+ GNUNET_TRANSPORT_peer_get_active_addresses_cancel (pal_ctx);
+ }
+ else
+ {
+ reconnect (pal_ctx);
+ }
return;
}
- abs_timeout = GNUNET_TIME_relative_to_absolute (timeout);
- msg = GNUNET_malloc (len);
- msg->header->size = htons (len);
- msg->header->type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP);
- msg->timeout = GNUNET_TIME_absolute_hton (abs_timeout);
- msg->addrlen = htonl (addressLen);
- char *addrbuf = (char *) &msg[1];
- memcpy (addrbuf, address, addressLen);
- char *tbuf = &addrbuf[addressLen];
- memcpy (tbuf, nameTrans, strlen (nameTrans) + 1);
- aluCB = GNUNET_malloc (sizeof (struct AddressLookUpCB));
- aluCB->cb = aluc;
- aluCB->cb_cls = aluc_cls;
- aluCB->timeout = abs_timeout;
- aluCB->client = client;
- GNUNET_CLIENT_transmit_and_get_response (client, msg->header, timeout,
- GNUNET_YES,
- &address_response_processor,
- aluCB);
- GNUNET_free (msg);
+
+ /* notify client */
+ address =
+ GNUNET_HELLO_address_allocate (&air_msg->peer, transport_name, addr,
+ alen);
+ pal_ctx->cb (pal_ctx->cb_cls, &air_msg->peer, address);
+ GNUNET_HELLO_address_free (address);
+ }
+
+ /* expect more replies */
+ GNUNET_CLIENT_receive (pal_ctx->client, &peer_address_response_processor,
+ pal_ctx,
+ GNUNET_TIME_absolute_get_remaining (pal_ctx->timeout));
+}
+
+
+/**
+ * Return all the known addresses for a specific peer or all peers.
+ * Returns continuously all address if one_shot is set to GNUNET_NO
+ *
+ * CHANGE: Returns the address(es) that we are currently using for this
+ * peer. Upon completion, the 'AddressLookUpCallback' is called one more
+ * time with 'NULL' for the address and the peer. After this, the operation must no
+ * longer be explicitly canceled.
+ *
+ * @param cfg configuration to use
+ * @param peer peer identity to look up the addresses of, CHANGE: allow NULL for all (connected) peers
+ * @param one_shot GNUNET_YES to return the current state and then end (with NULL+NULL),
+ * GNUNET_NO to monitor the set of addresses used (continuously, must be explicitly canceled)
+ * @param timeout how long is the lookup allowed to take at most (irrelevant if one_shot is set to GNUNET_NO)
+ * @param peer_address_callback function to call with the results
+ * @param peer_address_callback_cls closure for peer_address_callback
+ */
+struct GNUNET_TRANSPORT_PeerIterateContext *
+GNUNET_TRANSPORT_peer_get_active_addresses (const struct
+ GNUNET_CONFIGURATION_Handle *cfg,
+ const struct GNUNET_PeerIdentity
+ *peer, int one_shot,
+ struct GNUNET_TIME_Relative timeout,
+ GNUNET_TRANSPORT_PeerIterateCallback
+ peer_address_callback,
+ void *peer_address_callback_cls)
+{
+ struct GNUNET_TRANSPORT_PeerIterateContext *pal_ctx;
+ struct GNUNET_CLIENT_Connection *client;
+
+ client = GNUNET_CLIENT_connect ("transport", cfg);
+ if (client == NULL)
+ return NULL;
+ if (GNUNET_YES != one_shot)
+ timeout = GNUNET_TIME_UNIT_FOREVER_REL;
+ pal_ctx = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PeerIterateContext));
+ pal_ctx->cb = peer_address_callback;
+ pal_ctx->cb_cls = peer_address_callback_cls;
+ pal_ctx->cfg = cfg;
+ pal_ctx->timeout = GNUNET_TIME_relative_to_absolute (timeout);
+ if (NULL != peer)
+ pal_ctx->peer = *peer;
+ pal_ctx->one_shot = one_shot;
+ pal_ctx->client = client;
+ send_request (pal_ctx);
+
+ return pal_ctx;
}
+
+
+/**
+ * Cancel request for address conversion.
+ *
+ * @param alc handle for the request to cancel
+ */
+void
+GNUNET_TRANSPORT_peer_get_active_addresses_cancel (struct
+ GNUNET_TRANSPORT_PeerIterateContext
+ *alc)
+{
+ if (NULL != alc->client)
+ {
+ GNUNET_CLIENT_disconnect (alc->client);
+ alc->client = NULL;
+ }
+ if (GNUNET_SCHEDULER_NO_TASK != alc->reconnect_task)
+ {
+ GNUNET_SCHEDULER_cancel (alc->reconnect_task);
+ alc->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ GNUNET_free (alc);
+}
+
+
+/* end of transport_api_peer_address_lookup.c */
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